216384139 has 2 divisors, whose sum is σ = 216384140. Its totient is φ = 216384138.

The previous prime is 216384137. The next prime is 216384163. The reversal of 216384139 is 931483612.

216384139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 216384139 - 2¹ = 216384137 is a prime.

It is a super-2 number, since 2×216384139² = 93644191221542642, which contains 22 as substring.

Together with 216384137, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 216384098 and 216384107.

It is not a weakly prime, because it can be changed into another prime (216384131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108192069 + 108192070.

It is an arithmetic number, because the mean of its divisors is an integer number (108192070).

Almost surely, 2^216384139 is an apocalyptic number.

216384139 is a deficient number, since it is larger than the sum of its proper divisors (1).

216384139 is an equidigital number, since it uses as much as digits as its factorization.

216384139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 37.

The square root of 216384139 is about 14710.0013256288. The cubic root of 216384139 is about 600.3554736152.

The spelling of 216384139 in words is "two hundred sixteen million, three hundred eighty-four thousand, one hundred thirty-nine".